| 摘要 |
PURPOSE:To speed up main storage write access in a size which does not come to the generation unit of an error correction code by means of a main storage controller. CONSTITUTION:A main storage 3 managed by setting system bus width to be one sub-block and N-pieces of the sub-blocks to be one block is constituted of sub-main storages 30-0 to 30-(N-1) corresponding to N-pieces of the sub-blocks. A cache memory 41 is provided in the main storage controller 4 generating the correction code with system bus width as the unit. The main storage controller 4 rewrites only a data part in the requested sub-block among data into request data, extends it to system bus width, generates the correction code based on the extended data and writes it into the corresponding sub-storage in the main storage 3 if block data of a request destination is registered in the cache memory 41 when write access is the size which does not come to system bus width. |
